In discussions of the best single-artist Christmas album of all time, you could do a lot worse than James Brown's Funky Christmas, which is actually a distillation of three Christmas albums he recorded from 1966-1970. Brown actually rivals Sufjan Stevens in the wealth of really great Christmas songs he's recorded that are both seasonally appropriate and completely in his own personality. This is just one of many in that respect, but man, does it make me happy.